NC Math 3 Review: Circles

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where r is the radius.

Front

How do you calculate the area of a circle?

Back

A = πr², where r is the radius.

Front

What is the relationship between degrees and radians?

Back

180 degrees = π radians.

Front

How do you convert degrees to radians?

Back

Multiply degrees by π/180.

Front

What is the equation of a circle in standard form?

Back

(x-h)² + (y-k)² = r², where (h,k) is the center and r is the radius.

Front

What is the diameter of a circle?

Back

The diameter is twice the radius (d = 2r).

Front

How do you find the length of an arc?

Back

Arc length = (θ/360) * 2πr, where θ is the angle in degrees.

Front

What is the formula for the area of a sector of a circle?

Back

Area of sector = (θ/360) * πr², where θ is the angle in degrees.

Front

What is the definition of a chord in a circle?

Back

A chord is a line segment with both endpoints on the circle.

Front

What is the definition of a tangent to a circle?

Back

A tangent is a line that touches the circle at exactly one point.